docs: def fresh_working_set():
      """return a pkg_resources "working set", representing the *currently* installed packages"""
      class WorkingSetPlusEditableInstalls(pkg_resources.WorkingSet):
  
          def __init__(self, *args, **kwargs):
              self._normalized_name_mapping = {}
              super(WorkingSetPlusEditableInstalls, self).__init__(*args, **kwargs)
  
          def add_entry(self, entry):
              """Same as the original .add_entry, but sets only=False, so that egg-links are honored."""
              logger.debug('working-set entry: %r', entry)
              self.entry_keys.setdefault(entry, [])
              self.entries.append(entry)
              for dist in pkg_resources.find_distributions(entry, False):
  
                  # eggs override anything that's installed normally
                  # fun fact: pkg_resources.working_set's results depend on the
                  # ordering of os.listdir since the order of os.listdir is
                  # entirely arbitrary (an implemenation detail of file system),
                  # without calling site.main(), an .egg-link file may or may not
                  # be honored, depending on the filesystem
                  replace = (dist.precedence == pkg_resources.EGG_DIST)
                  self._normalized_name_mapping[normalize_name(dist.key)] = dist.key
                  self.add(dist, entry, False, replace=replace)
  
          def find_normalized(self, req):
              req = _package_req_to_pkg_resources_req(str(req))
              req.key = self._normalized_name_mapping.get(normalize_name(req.key), req.key)
              return self.find(req)
  
      return WorkingSetPlusEditableInstalls()